AIM (AOL Instant Messenger)
- Instant messaging (sometimes called IM or IMing) is the ability to easily see whether a chosen friend or co-worker is connected to the Internet and, if they are, to exchange messages with them. Instant messaging differs from ordinary e-mail in the immediacy of the message exchange and also makes a continued exchange simpler than sending e-mail back and forth. Most exchanges are text-only. However, some services allow attachments.
AOL first popularized instant messaging and, with its large membership, is likely to be the most popular service for some time to come. AOL's Instant Messenger can be used by AOL members but there is no requirement to be connected to the Internet through AOL. An open source alternative to AOL's instant messaging is called Jabber.